pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/payload/mverack_test.go

@@ -0,0 +1,17 @@
+package payload
+
+import (
+	"testing"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/command"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewVerack(t *testing.T) {
+
+	verackMessage, err := NewVerackMessage()
+
+	assert.Equal(t, nil, err)
+	assert.Equal(t, command.Verack, verackMessage.Command())
+}